Telegraph or telephone relay.



Wei/memes 0% ezzw C. STILLE.

TELEGRAPH 0R TELEPHONE RELAY.

APPLICATION ElLED MAR. 21. 1914.

Patented Sept. 21, 1915.

2 SHEETSSHEET I.

TELEGRAPH 0R TELEPHONE RELAY.

APPLICATION FILED 11,111.21, 1914.

Patented Sept. 21, 1915.

2 SHEETS-SHEE'I 2.

lA zz ncmey B1 6/ guy W cum STILLE, or zE'HLEnnoBr-wEsr, NEAR BERLIN, GERMANY.

TELEGRAIH OR TELEPHONE RELAY.

Specification of Letters Patent. Patented Sept. 21, 1915.-

Application filed March 21, 1914. Serial No. 826,319.

To all whom it may concern.

Be it known that I, CUR'r STILLE, doctor of philosophy, of'Zehlendorf-West, Germany, a .subject of the King of Prussia and whose post-ofiice address is 4/5 Biilowstrasse, Zehlendorf-West, near Berlin, Kingdom of Prussia, German Empire, have invented a new and useful Improved Telegraph or Telephone Relay, of which the following is a s ecification.

his invention relates to telegraph or telephone relays and has for its object to construct an lmproved device of this description.

'The present invention also makes useof the principle of rotating two coils in opposite directions in a strong magnetic field, but in carrying out the invention the coils do not carry the microphone contacts but are provided with arms which end in contact pieces which press in their turn against contact pieces of a fixed microphone. Preferably the microphones are arranged in-pairs so that a symmetrical apparatus is obtained.

Conducting wires lead from the -microphones to a switch which permits of the microphones being connected either singly in the ci'ibiiit or. in parallel or series or in groups. The microphones can also bemade with different materials according to the conditions for which the apparatus is required. For example different materials or different sizes of materials may be employed according to whether words or music is to be transmitted, or whether clearness or loud speaking is required. With microphones of different characteristics. as above pro osed the most suitable can be selected at Wlll or the most convenient combination of microphones can be employed.

In the accompanying drawing, Figure 1 is a side elevation partly sectional of the improved apparatus. Fig. 2 is a front view of the same and Fig. 3 is a plan in which parts are broken away. Fig. 4 is a diagram showing the electrical connections.

Referring now to Figs. 1 to 3, an electromagnet .is shown at A provided with pole pieces a and two coils B B are rotatably suspended between the oles by means of the adjustable support The suspension may be conveniently effected by flexible wires or springs 0 0 The current is led into the coils B B by flexible wires K, or slip rings may be provided for this purpose in a well known manner. The said coils are so connected that under the influence of a magnetfield they have a tendency to rotate in opposite directions. Mounted on the coils B, B are arms D D D, D with corresponding contact pieces d d d (i There are two coils but each coil is provided with four arms with corresponding contacts making in all eight contacts. The contact pieces d, d d d press against corresponding contact pieces 6, e e 6 onthe microphone E. It will be readily understood that by reason of the current circulating in the coils the latter are caused to rotate in opposite directions and thus cause a movement of the arms and contact pieces toward or against each otherby which means the pressure on the microphones is varied. In operation the telegraph or telephone currents are caused to flow through the coils B B which are thus rotated against each other in the strong magnetic field of the electromagnet. The rotation of these coils in turn efiects a change of the pressure of the contact pieces of the microphones corresponding to the change in the original telegraph or telephone current.

The electrical connections of the apparatusare shown in Fig. 4 in which coils B B are indicated as being connected in series in theoriginal telegraph or telephone circuit. The contacts 0?, d 0Z (Z and a battery F are in the circuit of the microphone E In this circuit is also connected through a transformer G. the telephone receiver H; said receiver can be connected directly with the battery F if desired.

What I do claim as my invention, and desire to secure by Letters Patent of the arms carried by the coils, and a plurality of fixed microphones each subjected to the pressure of an arm of the coils respectively substantially as described.

3. In a relay the combination of an electromagnet producing a strong magnetic field, two coils suspended in the field and In testimony whereof I have hereunto set adapted to be rotated 1nopposite directions, my hand in presence of two subscribing witsylnmetricully arranged arms carried by the nesses.

coils, and a plurality of fixed microphones CURT STILLE. 5 each subjected to the pressure of an arm of \Vitnesses:

the coils respectively substantially as de- HENRY HAsi-nn,

scribed. WVOLDEMAR IIAUPT. 

